His post on the Building Windows 8 blog included the following news about Office : “WOA includes desktop versions of the new Microsoft Word, Excel, PowerPoint, and OneNote. These new Office applications, codenamed “ Office 15”, have … The Microsoft Office Blog

SAN FRANCISCO — July 16, 2012 — Today, Microsoft Corp. CEO Steve Ballmer unveiled the customer preview of the new Microsoft Office, available at office.com/preview . The next release features an intuitive design that works beautifully with touch, stylus, mouse or keyboard across new Windows devices, including tablets.

If you need a way to create invoices in Excel, you can use one of the many invoice templates on Office.com. While these templates are a great starting point, they don't automatically generate unique invoice numbers—you need a macro for that.